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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/mapping-meta-field.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/mapping-meta-field.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/mapping-meta-field.html" rel="nofollow" target="_blank">../en/mapping-meta-field.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-node"><code class="literal">_meta</code> field</span>
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<h2 class="title">
<a id="mapping-meta-field"></a><code class="literal">_meta</code> field<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/mapping/fields/meta-field.asciidoc">edit</a>
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<p>A mapping type can have custom meta data associated with it. These are not
used at all by Elasticsearch, but can be used to store application-specific
metadata, such as the class that a document belongs to:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT my_index
{
  "mappings": {
    "_meta": { <a id="CO325-1"></a><i class="conum" data-value="1"></i>
      "class": "MyApp::User",
      "version": {
        "min": "1.0",
        "max": "1.3"
      }
    }
  }
}</pre>
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<div class="console_widget" data-snippet="snippets/733.console"></div>
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<p><a href="#CO325-1"><i class="conum" data-value="1"></i></a></p>
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<p>This <code class="literal">_meta</code> info can be retrieved with the
<a class="xref" href="indices-get-mapping.html" title="Get mapping API">GET mapping</a> API.</p>
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<p>The <code class="literal">_meta</code> field can be updated on an existing type using the
<a class="xref" href="indices-put-mapping.html" title="Put mapping API">PUT mapping</a> API:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT my_index/_mapping
{
  "_meta": {
    "class": "MyApp2::User3",
    "version": {
      "min": "1.3",
      "max": "1.5"
    }
  }
}</pre>
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